Chapter 5- How Populations Grow Flashcards Preview

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Flashcards in Chapter 5- How Populations Grow Deck (21):
1

Population density is

The number of individuals per unit area

2

What are the four characteristics that describe population

Geographic distribution
Density
Population age structure
Growth rate

3

What are two ways that a population can increase are

Immigration and increased birth rate

4

When does exponential growth occurs

Under ideal conditions such as unlimited resources, predation absence, and the absence of diseases

5

What shaped is the exponential growth rate curve

J shaped

6

Logistic growth occurs when

The birth rate decreases and and the death rate increases and when the birth rate and death rate occur at the sam state as resources become less available

7

What shape is the logistic growth curve

S shaped

8

What is the carrying capacity

The largest number of individuals that a given area can support

9

Density- Dependent limiting factors

Are limiting factors that depend on population size and density

10

Competition

Organisms compete for food, water, space, sun etc

11

Predation

Prey relationships is the best known population control mechanism

12

Parasitism

Taking nourishment from host organisms which often weakens them causing death and disease

13

Density independent factors

Population doesn’t influence the limiting factors they affect all populations in similar ways regardless of size

14

Why did the population grow in the industrial revolution

Everything was improved (hygiene and meds)

15

There are how many people in the world

7-8 bil

16

What were the two main improvement categories that made popluation rise in the US

Hygine-sewers and clean water
Antibiotics- drugs that kill bacteria

17

What is the life expectancy 2017

79-woman
78-man

18

Demography

Is the study of human population which includes the birth and death rate of a population along with the immigration and emigration numbers

19

What is the demographic transition

It’s when growth slows or stops when countries get birth control education money and knowledge

20

When will the earth level off and everyone will finish the demographic transition

When we get to 9-10 billion
Genetic engineering will help us feed all those people and we will not starve

21

What are 3 prominent killer diseases today

Malaria
Cholera
AIDS